JPH0339766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of manufacturing an aluminum tube containing a plastic-coated filament body, in which a plastic-coated filament body is housed within an aluminum tube body.

(Prior art) Conventionally, aluminum tubes with plastic-coated linear bodies were produced by applying aluminum tape vertically to the moving plastic-coated linear body, welding the joints, and sequentially applying the aluminum tape to the aluminum tube body and covering it with plastic. Continuous manufacturing of aluminum tubes containing striated bodies was carried out.

However, this manufacturing method has the disadvantage that the mechanical strength of the aluminum tube body differs between the welded part and other parts, and there is also a possibility that pinholes may occur in the welded part. .

In order to improve these drawbacks, a method of manufacturing an aluminum tube containing a plastic-coated filament body has recently been proposed, in which an aluminum tube body is directly extruded and coated on the outer periphery of the plastic-coated filament body.

This manufacturing method involves supplying an aluminum wire to a conduit between a groove formed on the circumferential surface of a rotating wheel for supplying extruded material of an extruder and a stationary shroud, while forcing the rotating wheel to rotate. Due to the accompanying friction between the aluminum wire and the rotating wheel, the aluminum wire is press-fitted into the container section in the fixed tube lock, and the aluminum inside the container section is extruded from between the die and the nipple to form the aluminum tube body. While molding, a plastic-coated filament is fed into the aluminum tube body through the center hole of the nipple to produce an aluminum tube containing a plastic-coated filament, and at this time, the plastic-coated filament is fed into the aluminum tube body from the center hole of the nipple. This is achieved by forcibly cooling the body and also forcibly cooling the outer periphery of the aluminum tube body on the outlet side of the die nipple.

In this method of manufacturing an aluminum tube containing a plastic-coated filament, the plastic-coated filament is supplied into the aluminum tube body being manufactured by extrusion molding to produce an aluminum tube containing a plastic-coated filament. The pipe body has uniform mechanical strength in the circumferential direction, there is no risk of pinholes, and it is possible to easily produce a plastic-coated, filament-filled aluminum pipe that has better performance than forming molded pipes. can. Further, since the plastic-coated filament is forcibly cooled on the entrance side of the nipple, it is possible to prevent the plastic-coated filament from being thermally damaged by the heat of molten aluminum. Further, since the aluminum tube is forcibly cooled from the outside, in combination with the above-mentioned cooling effect, the inner plastic-coated filament can be protected from heat.

However, with this manufacturing method, there is a problem that the plastic-covered filament that passes through the nipple in an undulating state due to its bending comes into contact with the nipple, which is heated by the heat of the aluminum inside the container, and is susceptible to thermal damage. It was hot. In addition, conventionally, the forced cooling of the plastic-coated filament at the entrance side of the nipple was performed indirectly using a helical cooling pipe, which had the problem of poor cooling efficiency and the large size of the cooling means. It was hot.

(Object of the Invention) An object of the present invention is to prevent the plastic-coated filament from receiving thermal loss when passing through the nipple, and to efficiently cool the plastic-coated filament on the entrance side of the nipple. It is an object of the present invention to provide a method for manufacturing an aluminum tube containing a plastic-coated filament which can be carried out using a small-sized device.

(Structure of the Invention) The present invention provides a method for supplying an aluminum wire to a conduit between a groove formed on the circumferential surface of a rotating wheel for supplying extruded material of an extruder and a stationary shroud, while simultaneously The aluminum wire is press-fitted into the container part in the fixed shoe block by the friction between the aluminum wire and the rotating wheel accompanying the forced rotation of the aluminum wire, and the aluminum in the container part is extruded from between the die and the nipple. While forming the aluminum tube body, a plastic-coated filament is fed into the aluminum tube body from the center hole of the nipple to manufacture an aluminum tube containing a plastic-coated filament; In the method for manufacturing an aluminum tube containing a plastic-coated filament body, the plastic-coated filament body is forcibly cooled and the outer periphery of the aluminum tube body is forcibly cooled on the exit side of the die nipple, wherein the plastic-coated filament body is forcibly cooled on the outlet side of the nipple. The covered filament is held by a spacer made of a heat insulating material so that it does not come into contact with the nipple, and the plastic covered filament is forcibly cooled on the inlet side of the nipple by blowing cooling gas directly into the nipple. It is characterized by being cooled by forced air.

(Example) Examples of the present invention will be described in detail below with reference to the drawings. As shown in the figure, the manufacturing method of the plastic-coated filament-containing aluminum tube of this embodiment includes a groove 3 formed on the circumferential surface of a rotating wheel 2 for supplying extruded material of an extruder 1, and a fixed tube block 4.
While supplying aluminum wire (including aluminum alloy wire) 7 from the supply bobbin 6 to the conduit 5 between the Under the action of the block 9, it is pressed into the container part 10 in the fixed block 4. Container part 10
The aluminum 8 press-fitted into the tube is extruded from between the die 11 and the nipple 12 to continuously extrude and form an aluminum tube body 13. Inside this aluminum tube body 13, there is a central hole 12 of the nipple 12.
A plastic-coated strand 14 such as a plastic-coated metal wire or a plastic-coated optical fiber is sequentially supplied from A to obtain an aluminum tube 15 containing a plastic-coated strand. The plastic-coated strip 14 is delivered from a supply bobbin 16 via a guide roll 17. Center hole 12A in nipple 12
Cooling gas made of compressed air is blown into the interior of the plastic-coated filament body 14 from the wind cooling nozzle 18.
is directly forced-air-cooled with the cooling gas to prevent the plastic-coated wire body 14 from being thermally damaged by the heat of the molten aluminum 8 transferred through the nipple 12. When cooling is performed by direct air cooling in this manner, unlike direct liquid cooling, it is possible to prevent the cooling liquid from entering the aluminum tube body 13, and the nipple 12 can also be cooled together. Further, on the tip side of the center hole 12A of the nipple 12, a spacer 19 made of a heat insulating material such as asbestos is provided.
is attached so that the corrugated plastic-covered filament 14 is held so as not to come into contact with the nipple 12. Aluminum tube body 13 released from die 11
Cooling water is sprayed from the nozzle 20 onto the outer periphery of the plastic-coated filament 1 for forced cooling.
4. Protect from heat. The cooled aluminum tube main body 13 is pressed by the presser roll 21 and passed through the blower 2.
Blow off the water and dry in step 2. The dried aluminum tube body 13 is then passed through a drawing die 23.
The film is passed through a machine to reduce its surface to a required size, and is taken up by a take-up machine (not shown) and wound up by a wind-up machine (not shown).
The aluminum wire 7 preferably contains 0.1 to 5% by weight of Mg in order to increase the compressive strength of the tube, and in this case, it may contain a small amount of impurities such as Mn, Cu, and Cr. The drawing die 23 preferably has a relatively small increase in wall thickness, a small drawing load, an area reduction of 10 to 15%, and an approach angle of 10 to 30 degrees.

The plastic striated aluminum tube, particularly the optical fiber-containing aluminum tube, produced in this way can be used as an optical fiber composite overhead line by being twisted into an overhead power transmission line or an overhead ground wire, for example.

(Effects of the Invention) As explained above, in the method for manufacturing an aluminum tube containing a plastic-coated filament according to the present invention, the tip of the nipple is Since it is held by a spacer made of a heat insulating material on the side, it is possible to prevent the plastic-covered filament from coming into contact with the nipple and being thermally damaged when it passes through the nipple. In addition, the forced cooling of the plastic-coated filament on the entrance side of the nipple is performed by blowing cooling gas directly into the nipple, so the plastic-coated filament can be efficiently cooled by direct cooling, and the nipple can also be cooled. It has the advantage of being able to cool down quickly. Furthermore, if the inlet side of the nipple is directly cooled by air, the cooling means can be made smaller and its installation position can be easily secured.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view showing an example of an apparatus for carrying out the method of the present invention. 1... Extruder, 2... Rotating wheel, 3...
Groove, 4...Fixing block, 5...Pipe line, 7...Aluminum wire, 8...Aluminum, 9...Stop block, 10...Container part, 11...Dice, 12...Nipple, 12A
... Center hole, 13 ... Aluminum tube body, 14
. . . Plastic-coated linear body, 15 .

Claims (1)

[Claims] 1. While supplying an aluminum wire to a conduit between a fixed tube block and a groove formed on the circumferential surface of a rotating wheel for supplying extruded material of an extruder, the aluminum wire and the rotation caused by forced rotation of the rotating wheel are supplied. The aluminum wire is press-fitted into the container part in the stationary shoe block by friction with the wheel, and the aluminum in the container part is extruded from between the die and the nipple to form an aluminum tube body, while the aluminum wire is pushed out from the center hole of the nipple. A plastic-coated filament is fed into the aluminum tube body to produce an aluminum tube containing a plastic-coated filament, and at this time, the plastic-coated filament is forcibly cooled on the inlet side of the nipple, and the die In the method for manufacturing an aluminum tube containing a plastic-coated filament body, in which the outer periphery of the aluminum tube body is forcibly cooled on the outlet side of the nipple, a heat insulating material is provided on the tip side of the nipple to prevent the plastic-coated filament body from coming into contact with the nipple. The plastic-coated filament is held by a spacer made of Method for manufacturing aluminum tubes with body parts.